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Extending the Cookie.ExpirationDurationMinutes* metrics through
mid-2021. This data will be helpful in informing potential future work
on limiting lifetime of cookies. Also, splitting up the histogram
based on whether the 'Secure' attribute is specified, since we may
target intervention on non-secure cookies, as per
draft-west-cookie-incrementalism.html#rfc.section.3.6

Bug: 1088694
Change-Id: Ief1fe0b732df34b71d29f5e0a72dfb40fd9a0851
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2445910Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Kaustubha Govind <kaustubhag@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813950}